Things I don't believe even when the nice people on TV tell me:
Orange juice is bad for me.
That my life is better because cable can now provide internet access. (And if it is true why won't cable let the phone companies provide cable?)
That all those 'real' people weren't paid for that ad. (You can be paid to tell the truth, but still.)
That none of those people in all those skin commercials have ever used anything other than what they are shilling right now.
That it is still water after you add flavor, sweetener, protein, cheese, and so on.
That anything that only gets 20 mpg on the highway gets great gas mileage. (Great compared to what - a tractor trailer?)